How to create zip file for DFU?

[Newbie]

Hello, I am using nrf52 with sdk 12.2.0. I am working with example buttonless dfu template aplication by referring to the link infocenter.nordicsemi.com/index.jsp . I have uploaded the example code in my pca10040. Now stuck at creating a dfu zip file. I created the zip file for secure dfu but it had public key included in zip file as well. So should I follow the same steps to create the file for this example as well? I tried this command nrfutil pkg generate --hw-version 52 --sd-req 0x8C --application-version 0xff --application app.hex app_dfu_package.zip But it gave me error of keyfile. So if I dont have keyfile then what command should I use? I am attaching the image of error.nrfkeyfileerror.PNG

Error 1 - 1.PNG Thanks, Shailav

[Vidar Berg]

Hello, you need to create your own key pair with nrfutil, please refer to the documentation here (link) for more details.

[Newbie]

Hello, But I am not using secure ble so why do I need to create my own key? If I am creating my own keys how to add files to my code? I am using the same code that you sent me. Thanks

[Vidar Berg]

Bootloader in SDK 12.2.0 will only accept signed FW images. The code I sent you earlier was for the buttonless part (i.e., jump from application to bootloader), and not related the dfu process itself.

Recommend to read the following documentation to get an overview of the new DFU feature:

• bootloader modules
• Bootloader with DFU example
• Buttonless extention

[Newbie]

Hi, Suppose I want to update my nrf firmware over the air so can I use the code that you send you? As it has device firmware update service. For example there is one existing firmware on my nrf kit and now I want to update new firmware through nrf app so what should I do?

[Vidar Berg]

Forgot to give you the link to Hung's blog post, which is a supplement to the existing documentation and explains how you can perform OTA update: https://devzone.nordicsemi.com/blogs/1085/getting-started-with-nordics-secure-dfu-bootloader/